JP6379062B2 - Outdoor unit of air conditioner and bell mouth provided therein - Google Patents

Description

  The present invention relates to an outdoor unit of an air conditioner and a bell mouth provided therein.

  In recent years, there is an increasing demand for energy saving for air conditioners. In order to save energy, it is important to improve the efficiency of the outdoor unit of the air conditioner. For example, even when the propeller fan provided in the outdoor unit is rotationally driven at a low speed, the energy associated with the rotational driving of the propeller fan can be reduced if a sufficient flow of wind is generated by the propeller fan. In addition, noise can be reduced by rotating the propeller fan at a low speed.

  As described above, there is a demand for an outdoor unit that achieves both high efficiency and low noise. Therefore, in relation to such a technique, Patent Document 1 discloses a propeller having a plurality of blades that rotate around a rotation axis that extends in the direction of gravity and generates a gas flow in a direction opposite to the direction of gravity. An outdoor unit blower comprising a fan and a bell mouth for forming an annular wall surface outside the outer peripheral end of the blade along the rotation direction of the blade of the propeller fan and rectifying the gas is described. ing.

And in patent document 1, when the operating point of the said propeller fan is located in an open | release side rather than a surging area | region, this bell mouth is the wall surface used as an inclined surface formed so that the wind path on the blowing side might expand And the relationship between the length H in the rotation axis direction between the suction side and the discharge side end of the slope and the fan diameter D of the propeller fan is H / D ≧ 0.04, The angle θ between the connecting straight line and the rotation axis is 0 <θ ≦ 60 °, and the length L in the rotation axis direction from the suction side opening portion to the suction side end portion of the inclined surface and the rotation axis It is described that the shape satisfying the condition that the length L ₀ of the propeller fan blades L ₀ in the direction satisfies L / L ₀ ≧ 0.5 is integrally formed.

Japanese Patent No. 5611360

  In order to achieve both high efficiency and low noise in the outdoor unit, the height of the bell mouth arranged around the propeller fan may be increased from the viewpoint of generating a smooth wind flow. Also, the bell mouth is often made of resin from the viewpoint of ease of molding. The resin bell mouth is often integrally molded. In particular, in an outdoor unit that blows a large-sized propeller fan having an outer diameter exceeding 500 mm, it is common to use an integrally molded resin bell mouth.

  However, resin-made bell mouths tend to have insufficient strength and roundness accuracy compared to sheet-metal bell mouths. In particular, if the strength or roundness is insufficient, the distance between the inner wall of the bell mouth and the propeller fan becomes uneven, and the wind flow is likely to be disturbed when the wind flows. Therefore, when the propeller fan is driven to rotate at a low speed in order to save energy, the flow of wind is less likely to occur. Therefore, the efficiency tends to decrease. In addition, noise tends to increase with the disturbance of the wind flow.

  In this regard, Patent Document 1 describes that energy saving and noise reduction are achieved. However, in the technique described in Patent Document 1, the inner wall of the bell mouth is configured to have a uniform slope (oblique portion) (see Claim 1 of Patent Document 1, FIG. 1 and the like). For this reason, the bell mouth is still easily bent, and the technique described in Patent Document 1 still has problems in the strength of the bell mouth and the precision of the roundness. For this reason, there is still room for improvement in terms of higher efficiency and lower noise.

  In view of these points, in a plastic bell mouth, in order to improve the accuracy of strength and roundness, a place that does not affect the performance of the bell mouth, for example, the outer wall surface of the straight pipe constituting the bell mouth It is also conceivable to take measures such as providing ribs.

  FIG. 9 is a view showing a bell mouth 202 provided in an outdoor unit (not shown) of a conventional air conditioner, in which (a) is a perspective view and (b) is a sectional view thereof. The bell mouth 202 is attached to the outdoor unit on the suction side opening 210 side. As shown in FIG. 9A, the bell mouth 202 accommodates the propeller fan 101 constituting the outdoor unit. Therefore, when the propeller fan 101 is driven to rotate in the direction indicated by the solid line arrow in FIG. 9 around the rotation shaft 114 (see FIG. 9B), the air sucked from the suction side opening 210 is discharged to the discharge side opening. It will be discharged from the bell mouth 202 through the section 212.

  As shown in FIG. 9B, the bell mouth 202 includes a straight pipe 211 between the suction side opening 210 and the discharge side opening 212. A plurality of ribs 213 are provided on the outer surface of the straight pipe 211 so as to surround the straight pipe 211. By providing such a rib 213, the rigidity of the straight pipe 211 is increased, and the accuracy of strength and roundness is improved.

  However, when the rib 213 is provided on the outer surface of the bell mouth 202, the size of the bell mouth 202 is increased, and the manufacturing cost is increased. In particular, since the overall size of the bell mouth 202 is increased by the rib 213, the installation location of the bell mouth 202 may be limited. On the other hand, when the bell mouth 202 having the same size is considered, since the inner diameter of the straight pipe portion 211 is reduced by providing the rib 213, the size of the propeller fan 101 that can be arranged is limited. Sometimes. In particular, in the outdoor unit of the top blowing that mounts the large propeller fan 101 having an outer diameter exceeding 500 mm as described above, the bell mouth 202 is desired to be downsized in order to reduce the installation area of the outdoor unit.

  The present invention has been made to solve these problems, and the problem to be solved by the present invention is to reduce the cost and increase the degree of freedom of the installation location, while further increasing the efficiency and reducing the efficiency. It is an object to provide an outdoor unit of an air conditioner that achieves noise reduction and a bell mouth provided therein.

The present inventors have intensively studied to solve the above problems. As a result, the following findings were found. That is, the gist of the present invention is a propeller fan that generates a flow of wind by being rotationally driven, and a bell mouth that is arranged around the propeller fan and through which the wind flows when the propeller fan is rotationally driven. And a driving device that rotationally drives the propeller fan, and the bell mouth includes a trunk portion that accommodates the propeller fan, and a downstream side in a flow direction of wind generated by the rotational driving of the propeller fan. And an opening on the discharge side formed so as to be larger than the inner diameter of the body portion, and an opening on the upstream side in the wind flow direction of the propeller fan, and supplying air to the propeller fan A suction-side opening that is a mouth, and between the barrel and the discharge-side opening and on the inner wall surface of the bell mouth, the flow of wind as viewed from the propeller fan So as to surround the propeller fan on the downstream side of the direction, stair-shaped step portion is formed, wherein the stepped portion has a plurality of stages form relates outdoor unit of an air conditioner.

Another gist of the present invention is a propeller fan provided in an outdoor unit of an air conditioner, which is disposed around the propeller fan that generates a wind flow by rotational driving, and accommodates the propeller fan. And a discharge side opening formed on the downstream side in the direction of the flow of wind generated along with the rotational drive of the propeller fan and opened to be larger than the inner diameter of the body portion, An opening on the upstream side in the direction of wind flow of the propeller fan, and a suction side opening that is an air supply port to the propeller fan, the trunk portion and the discharge side opening the inner wall surface between the propeller fan viewed from so as to surround the propeller fan on the downstream side of the wind flow direction, stair-shaped step portion is formed, said step portion is a plurality of stages form A butterfly, on the bell mouth.

  According to the present invention, it is possible to provide an outdoor unit of an air conditioner and a bell mouth provided therein that achieves further higher efficiency and lower noise while increasing the degree of freedom of installation location at low cost. it can.

It is an end view which shows the outdoor unit of the air conditioner of 1st embodiment. It is a perspective view of the bell mouth with which the outdoor unit of the air harmony machine of a first embodiment is equipped. It is sectional drawing of the bellmouth with which the outdoor unit of the air conditioner of 1st embodiment is equipped. It is an expanded sectional view near the level difference part which constitutes the bell mouth with which the outdoor unit of the air harmony machine of a first embodiment is equipped. It is a figure which shows the bellmouth with which the outdoor unit of the air conditioner of 2nd embodiment is equipped, Comprising: (a) is the perspective view, (b) is the sectional drawing. It is a figure which shows the mode of the vortex which arises when air passes the level | step-difference part when air flows in the bellmouth, (a) is the bellmouth of 1st embodiment shown in FIG. 2, (b) is It is the bell mouth of 2nd embodiment shown in FIG. It is sectional drawing of the bellmouth with which the outdoor unit of the air conditioner of 3rd embodiment is equipped. It is sectional drawing of the bellmouth with which the outdoor unit of the air conditioner of 4th embodiment is equipped. It is a figure which shows the bell mouth with which the outdoor unit of the conventional air conditioner is equipped, (a) is the perspective view, (b) is the sectional drawing.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings as appropriate. In the following, four embodiments will be described, but the same members are denoted by the same reference numerals.

[1. First embodiment]
FIG. 1 is an end view showing an outdoor unit 10 of the air conditioner according to the first embodiment. In FIG. 1, for simplification of illustration, a part of the device provided inside the outdoor unit 10 is simplified or omitted. The air conditioner includes an outdoor unit 10 provided outside and an indoor unit (not shown) provided indoors connected to the outdoor unit 10 by a refrigerant pipe (not shown). Then, a refrigerant (not shown) is exchanged between the outdoor unit 10 and the indoor unit, so that a cooling operation and a heating operation are performed by the indoor unit.

  The outdoor unit 10 is driven to rotate to generate a flow of wind, and the propeller fan 101 that discharges air after heat exchange in the heat exchanger 105 (described later) to the outside, and around the propeller fan 101 A bell mouth 102 that is disposed and through which wind flows as the propeller fan 101 rotates is provided, and a motor 103 (drive device) for driving the propeller fan 101 to rotate. The outdoor unit 10 also includes a mesh-shaped fan guard arranged to cover the propeller fan 101 at the upper end of the clamp 104 that supports the motor 103, the housing 100 that houses various air conditioners, and the bell mouth 102. 109.

  Inside the housing 100, a heat exchanger 105 for exchanging heat between the outside air taken in from the outside and the refrigerant, a compressor 106 for compressing the refrigerant, and an accumulator (accumulator for storing high-pressure refrigerant). ) 107 and an electrical component box 108 that houses electrical components (not shown) for controlling the motor 103, the compressor 106, the accumulator 107, and the like. These are all connected to an external power source (not shown) and driven by power from the external power source.

  FIG. 2 is a perspective view of the bell mouth 102 provided in the outdoor unit 10 of the air conditioner of the first embodiment. In FIG. 2, the propeller fan 101 indicated by a two-dot chain line is also shown for convenience of explanation. The bell mouth 102 includes a straight pipe portion 111 (body portion) that houses the propeller fan 101, a downstream side in the direction of the flow of wind generated by the rotational drive of the propeller fan 101, and the inner diameter of the straight pipe portion 111. A discharge-side opening 112 formed so as to increase in size, and a suction-side opening 110 formed as an opening on the upstream side in the wind flow direction of the propeller fan 101 and serving as an air supply port for the propeller fan 101. And is configured. The bell mouth 102 of the first embodiment is made of resin and is integrally molded.

  The propeller fan 101 disposed between the straight pipe portion 111 and the discharge-side opening 112 and on the upstream side of the wind flow is surrounded by the inner wall surface of the bell mouth 102 (in the first embodiment, A stepped step 113 is formed above the propeller fan 101. That is, the step 113 is formed so as to surround the propeller fan 101 on the downstream side of the wind flow as viewed from the propeller fan 101. Further, the stepped portion 113 has an angle of 90 ° in the present embodiment. Further, the bell mouth 102 of the first embodiment is formed with two steps (a plurality of steps) 113. When the bell mouth 102 is attached to the housing 100, the bell mouth 102 is attached such that these stepped portions 113 are disposed above the upper end of the propeller fan 101 (see also FIG. 1). .

  The suction opening 110 of the bell mouth 102 is connected to the housing 100 described with reference to FIG. On the other hand, the fan guard 109 described with reference to FIG. 1 is disposed so as to cover the discharge-side opening 112 of the bell mouth 102. Then, the propeller fan 101 rotates in the direction indicated by the solid line arrow in FIG. 2, so that air flows into the bell mouth 102 from the suction side opening 110 and the inflowed air flows from the discharge side opening 112 to the bell mouth. It is discharged out of 102. Here, the air flowing into the bell mouth 102 from the suction side opening 110 is the air after the heat exchange in the heat exchanger 105.

  FIG. 3 is a cross-sectional view of the bell mouth 102 provided in the outdoor unit of the air conditioner of the first embodiment. In FIG. 3, an arrow indicated by a thick line indicates a wind flow X generated by the rotation driving of the propeller fan 101. As shown in FIG. 3, the bell mouth 102 has a shape that expands in the left-right direction by a step 113 from the straight pipe portion 111 to the upper discharge side opening 112.

  In the bell mouth 102 of the present embodiment, the step moment 113 increases the cross-sectional secondary moment of the bell mouth 102. Therefore, even if a conventional rib (see FIG. 9) is not provided, the bending of the straight pipe portion 111 is particularly suppressed, and the strength and roundness precision of the straight pipe portion 111 are reduced while suppressing the manufacturing cost. Enhanced. Further, by increasing the precision of the strength and roundness, the distance between the propeller fan 101 and the inner wall of the straight pipe portion 111 (corresponding to the distance G1 and the distance G2 in the cross-sectional view shown in FIG. 2) is determined. The entire rotation direction of the fan 101 can be made uniform. In particular, since a member such as a rib is not provided on the outer surface of the straight pipe portion 111, the thickness of the straight pipe portion 111 can be made more uniform and the variation in the local distance can be suppressed. As a result, a sufficient wind flow X can be generated inside the bell mouth 102 even at a low rotational speed, and high efficiency can be achieved. Furthermore, blade-passage frequency noise (noise that is prominent at the product of the number of rotations of the propeller fan 101 and the number of blades and multiples thereof) due to the non-uniformity of the distances G1 and G2 can be reduced and the noise can be reduced. Is planned.

  The degree of spread by the step 113 is an angle formed by the intersection of a straight line connecting the corner 113a1 of the first step and the corner 113a2 of the second step and a straight line parallel to the rotation axis 114 of the propeller fan 101. θ1 is, for example, 15 ° to 25 °, and preferably about 20 °.

  Further, the step 113 that is farthest from the discharge-side opening 112 (that is, the step 113 that is closest to the suction-side opening 110) is located higher than the upper end of the propeller fan 101. That is, the bell mouth 102 is attached to the housing 100 shown in FIG. 1 so that the step 113 does not overlap the propeller fan 101. By doing in this way, the portion of the straight pipe portion 111 in which the precision of the strength and the roundness is particularly enhanced and the propeller fan 101 come to face each other. Therefore, the inner wall of the straight pipe portion 111 and the propeller fan 101 Can be maintained uniformly, and higher efficiency and lower noise can be achieved more sufficiently.

  FIG. 4 is an enlarged cross-sectional view of the vicinity of the step portion 113 constituting the bell mouth 102 provided in the outdoor unit of the air conditioner of the first embodiment. When the propeller fan 101 is rotationally driven, the wind flow X is generated as described above, and accordingly, an air swirl Y is generated in each step 113. And if the magnitude | size of this eddy current Y becomes large, the flow of a wind will be disturb | confused, As a result of the pressure fluctuation near this level | step-difference part 113 becoming large, it exists in the tendency for noise to become large.

  Therefore, from the viewpoint of reducing the size of the vortex Y, it is preferable that the height of the step 113 is low. In other words, the size of the step 113 is preferably small. In addition, it is preferable that a plurality of stepped portions 113 are formed rather than a single stepped portion 113. By forming the plurality of step portions 113, the size of the eddy current Y generated when only one step portion Y is formed can be dispersed, and the size of the vortex flow Y can be reduced. .

  And by making the magnitude | size of the eddy current Y small, the pressure fluctuation in the level | step-difference part 113 can be suppressed, and sufficient noise reduction can be aimed at. Further, since the wind can easily flow by reducing the size of the vortex Y and suppressing the pressure fluctuation, the rotational driving force of the propeller fan 101 can be suppressed and further efficiency can be improved.

[2. Second embodiment]
FIGS. 5A and 5B are views showing a bell mouth 102A provided in the outdoor unit of the air conditioner of the second embodiment, in which FIG. 5A is a perspective view and FIG. 5B is a cross-sectional view thereof. Similar to the bell mouth 102, the bell mouth 102A is attached to an outdoor unit of an air conditioner (not shown). In the bell mouth 102A shown in FIG. 5, the same parts as those of the bell mouth 102 (see FIGS. 2 and 3) are denoted by the same reference numerals, and detailed description thereof is omitted.

  In the bell mouth 102, the plurality of step portions 113 are each formed in an annular shape (see FIG. 2). That is, in the bell mouth 102, the step 113 is formed with a plurality of surfaces. However, in the bell mouth 102 </ b> A of the second embodiment, as shown in FIG. 5A, the stepped portion 113 is formed in a spiral shape so as to surround the propeller fan 101. That is, in the bell mouth 102 </ b> A of the second embodiment, the step 113 is formed including a surface that is inclined in the rotation direction of the propeller fan 101.

  In other words, in the bell mouth 102, as shown in FIG. 3, the stepped portion 113 is provided symmetrically in a cross-sectional view around the rotation axis of the propeller fan 114. However, in the bell mouth 102A of the second embodiment, as shown in FIG. 5B, the stepped portion 113 is asymmetrical in a cross-sectional view around the rotation axis of the propeller fan 114. The direction in which the spiral formed by the step 113 spreads (the direction in which the spiral step 113 spreads toward the discharge-side opening 112) is the rotation direction of the propeller fan 101 indicated by the thick solid line in FIG. Is consistent with

  FIG. 6 is a view showing a state of the vortex Y generated when air passes over the stepped portion 103 when air flows through the bell mouths 102 and 102A. FIG. 6A is a first embodiment shown in FIG. The form of the bell mouth 102, (b) is the bell mouth 102A of the second embodiment shown in FIG. FIG. 6 shows a flow state on the inner walls of the bell mouths 102 and 102A.

  As described in the description of FIG. 4 above, when air flows through the inside of the bell mouth 102 by the propeller fan 101, a vortex Y is generated in the step 113 formed on the inner wall thereof. In the cross-sectional view shown in FIG. 4, this eddy current Y seems to be generated in a plane for the sake of illustration, but in actuality, as shown in FIG. 113b1 and 113b2 (113) are formed in a spiral shape on the surface. The reason why the vortex flow Y is formed in a spiral form in the diagonally upward direction is that the propeller fan 101 generates an upward wind flow X (see FIG. 3) and also a wind flow toward the rotation direction of the propeller fan 101 (illustrated). Not).

  Therefore, both the upward wind flow and the wind flow in the rotational direction of the propeller fan 101 are generated inside the bell mouth 102. For this reason, in the bell mouth 102 shown in FIG. 6A, the flow of wind in the direction from the right side to the left side of the paper (the flow in the rotational direction) passes over the first step 113b1 by the upward flow. This occurs on the upper surface of the second step 113b2. When the wind flows over the first step 113b1, the climb angle θ2 increases, so that the pressure fluctuation increases and the eddy current Y tends to increase. For this reason, the efficiency tends to decrease and the noise tends to increase.

  However, in the bell mouth 102A of the second embodiment shown in FIG. 6B, the spiral step portion 113 is provided in the same direction as the rotation direction of the propeller fan 101. Therefore, when the flow in the rotational direction is pushed upward by the upward flow, and the wind flows over the stepped portion 113b1, the climb angle θ3 becomes small. Thereby, compared with the said bell mouth 102, the pressure fluctuation at the time of getting over can be suppressed, and it can suppress that the eddy current Y becomes large. Therefore, it is possible to sufficiently suppress a decrease in efficiency and to sufficiently suppress an increase in noise.

[3. Third embodiment]
FIG. 7 is a cross-sectional view of the bell mouth 102B provided in the outdoor unit of the air conditioner of the third embodiment. Similarly to the bell mouth 102 of the first embodiment, the bell mouth 102B of the third embodiment is provided with a plurality of step portions 113. However, in the bell mouth 102B shown in FIG. 7, unlike the bell mouth 102 (see FIG. 3), the size of each step 113 is different.

  That is, in the bell mouth 102B of the third embodiment, the height of the step 113 is gradually changed from the vicinity of the propeller fan 101 upward (toward the downstream side in the wind flow direction). It has become. Specifically, in the bell mouth 102B, the height of the stepped portion 113 closest to the propeller fan 101 is the lowest, and the height of the stepped portion 113 gradually increases from the stepped portion 113 upward. Yes.

  In the vicinity of the propeller fan 101, the speed of the wind flow is the fastest. Therefore, the vortex Y tends to increase at the step 113. On the other hand, the further away from the propeller fan 101, the slower the speed of the wind flow and the smaller the vortex Y tends to be. Therefore, in the bellmouth 102B, the height of the step 113 at the part where the speed of the wind flow is the fastest is reduced, and the size of the vortex Y is reduced. Thereby, high efficiency and low noise of the propeller fan 101 are achieved in a portion where the wind flow is fast.

  On the other hand, the size of the stepped portion 113 is increased corresponding to the fact that the speed decreases as the propeller fan 101 moves away. Thereby, although the eddy current Y can be easily generated, since the flow of the wind is slow, the size of the eddy current Y is not easily increased, and sufficient high efficiency and low noise can be achieved. In addition, since the size of the stepped portion 113 is increased, the rigidity of the bell mouth 102B can be increased, and the strength and roundness precision of the straight tube portion 111 can be increased. Thereby, further higher efficiency and lower noise can be achieved.

[4. Fourth embodiment]
FIG. 8 is a cross-sectional view of a bell mouth 102C provided in the outdoor unit of the air conditioner of the fourth embodiment. Similar to the bell mouth 102B (see FIG. 7), the height of the step 113 is also increased in the bell mouth 102C from the vicinity of the propeller fan 101 upward (toward the downstream side in the wind flow direction). Is gradually changing. However, unlike the bell mouth 102B, the height of the step 113 is gradually lowered as it goes upward.

  If the propeller fan 101 becomes larger, the inner diameter of the straight pipe portion 111 that accommodates it increases. For this reason, in the straight pipe portion 111 having a large inner diameter, the rigidity of the straight pipe portion 111 tends to be particularly required as compared with the straight pipe portion 111 having a small inner diameter. In such a case, the height of the step 113 in the vicinity of the propeller fan 101 is set to the highest. Thereby, the rigidity of the straight pipe part 111 is sufficiently secured, and the precision of strength and roundness can be increased.

  Moreover, since the speed of the wind flow of the propeller fan 101 is slow as described above, the size of the vortex Y (not shown in FIG. 8) formed in the stepped portion 113 is reduced. Therefore, even if the height of the step 113 near the propeller fan 101 is high, it is unlikely to hinder high efficiency and low noise. Therefore, in the bell mouth 102C of the fourth embodiment, by forming the step portion 113 in this way, the rigidity of the straight pipe portion 111 is increased to increase the strength and the precision of the roundness, while increasing the efficiency and reducing the accuracy. Noise reduction is planned.

[5. Modified example]
As mentioned above, although four embodiment was described referring drawings, this embodiment is not restrict | limited to each said embodiment at all. Therefore, for example, the following modifications may be made in each embodiment, or the embodiments may be combined as appropriate.

  For example, in the bell mouths 102, 102A, 102B, and 102C of each of the embodiments described above, the number of steps 113 provided is not limited to the illustrated example. That is, as described above, although the number of stepped portions 113 provided is preferably plural, only one stepped portion 113 may be provided. Furthermore, in the case where a plurality of step portions 113 are provided, the number of steps may be two or more, and may be three, in addition to two or four as shown, and may be five or more. May be.

  Further, when the step 113 is spiral as shown in FIG. 5, for the sake of convenience, one round of the spiral is referred to as “one step 113”. Accordingly, the step 113 formed of a spiral having two rounds corresponds to the “two steps 113”, and the step 113 formed of a spiral of three or more turns corresponds to the “three or more steps 113”.

  Furthermore, in the case where the height of the step 113 is gradually changed, the height is gradually increased or decreased in FIGS. 7 and 8. You may make it become high and may make it low from the said site | part in the middle. On the contrary, as it goes upward, it may be gradually lowered to the middle part and may be higher from the middle part.

  In addition, even when the step 113 is formed in a spiral shape, in the example shown in FIG. 5, the height is the same in all parts, but may be gradually increased toward the upper side, It may be gradually lowered.

  Furthermore, for example, in the bell mouths 102, 102A, 102B, and 102C of the respective embodiments described above, the inner diameter of the straight pipe portion 111 changes midway, and the inner diameter of the suction side opening 110 that constitutes the straight pipe portion 111 is It is larger than the inner diameter near the center of the straight pipe portion 111 (see, for example, FIG. 3). That is, for example, as shown in FIG. 3, the lower end of the bell mouth 102 has a slightly swollen shape. However, the inner diameter of the straight pipe portion 111 may be the same over the entire area. That is, the straight pipe portion 111 may have a cylindrical shape without swelling.

  The bell mouths 102, 102A, 102B, and 102C described above are all provided in the outdoor unit 10 of the air conditioner. However, the configuration of the outdoor unit 10 is not limited to the illustrated example, and the bell mouth of the present embodiment. Can be provided in an outdoor unit of an air conditioner having an arbitrary configuration.

DESCRIPTION OF SYMBOLS 10 Outdoor unit 101 Propeller fan 102,102A, 102B, 102C Bell mouth 110 Suction side opening part 111 Straight pipe part 112 Discharge side opening part 113 Step part 114 Rotating shaft

Claims (6)

A propeller fan that generates a flow of wind by rotating and driving,
A bell mouth that is arranged around the propeller fan and through which the wind flows as the propeller fan rotates;
A drive device that rotationally drives the propeller fan,
The bell mouth is
A trunk portion that houses the propeller fan;
A discharge-side opening formed on the downstream side in the flow direction of the wind generated in association with the rotational drive of the propeller fan, and opened so as to be larger than the inner diameter of the body portion;
An opening on the upstream side in the wind flow direction of the propeller fan, and a suction side opening that is an air supply port to the propeller fan.
A stepped step portion between the trunk portion and the discharge-side opening and on the inner wall surface of the bell mouth so as to surround the propeller fan on the downstream side in the wind flow direction as viewed from the propeller fan. Formed ,
The outdoor unit of an air conditioner, wherein the step portion is formed in a plurality of steps . Each height of the step portion of the formed plurality of stepped portions, toward the downstream side of the air flow direction from the propeller fan, characterized in that gradually changes, claims The outdoor unit of the air conditioner described in 1 . The outdoor of the air conditioner according to claim 2 , wherein the height of the formed stepped portion is gradually increased toward the downstream side in the flow direction of the wind from the propeller fan. unit. The outdoor height of the air conditioner according to claim 2 , wherein the height of the formed stepped portion is gradually lowered toward the downstream side in the flow direction of the wind from the propeller fan. unit. A propeller fan that generates a flow of wind by rotating and driving,
A bell mouth that is arranged around the propeller fan and through which the wind flows as the propeller fan rotates;
A drive device that rotationally drives the propeller fan,
The bell mouth is
A trunk portion that houses the propeller fan;
A discharge-side opening formed on the downstream side in the flow direction of the wind generated in association with the rotational drive of the propeller fan, and opened so as to be larger than the inner diameter of the body portion;
An opening on the upstream side in the wind flow direction of the propeller fan, and a suction side opening that is an air supply port to the propeller fan.
A stepped step portion between the trunk portion and the discharge-side opening and on the inner wall surface of the bell mouth so as to surround the propeller fan on the downstream side in the wind flow direction as viewed from the propeller fan. Formed ,
The step portion is formed in a spiral shape so as to surround the propeller fan on the downstream side in the wind flow direction as seen from the propeller fan.
The outdoor unit of an air conditioner , wherein a rotation direction of the propeller fan and a direction in which the spiral stepped portion expands toward the discharge side opening are the same . A propeller fan provided in an outdoor unit of an air conditioner, which is disposed around the propeller fan that generates a flow of wind by rotational driving,
A trunk portion that houses the propeller fan;
A discharge-side opening formed on the downstream side in the flow direction of the wind generated in association with the rotational drive of the propeller fan, and opened so as to be larger than the inner diameter of the body portion;
An opening on the upstream side in the wind flow direction of the propeller fan, and a suction side opening that is an air supply port to the propeller fan.
A stepped step portion is formed on the inner wall surface between the trunk portion and the discharge-side opening so as to surround the propeller fan on the downstream side in the wind flow direction as viewed from the propeller fan .
The bell mouth is characterized in that the step portion is formed in a plurality of steps .

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